[Cthulhu_]

Tries to, but it too is flawed; misinterpretation of numbers, falsifying of numbers, publishing papers as a means to inflate one's own ego / CV, not publishing studies that don't look positive, and of course, companies and industries funding studies into the positive parts of their 'thing', see for example the campaign against 'fat' in the eighties (funded by the grain and sugar industries), being replaced with the campaign against sugar and carbs in the past two or so decades.

I'm sure all of those studies had merit, had adequate numbers, were peer reviewed and everything... but they were still made with an Agenda, and worse, picked up by the mainstream media so that they could push lifestyle advice, diets, and promote one category of products over another.

The "Truth" is in the middle, of course, and to make a completely opinion based and unscientific statement, too much of anything / overconsumption is a bad thing, but that's too vague a statement or advice; people like being told "avoid doing / eating this" and "do / eat that instead", sticking to simple rules as a lifestyle choice.